jsmin.php in Javascript Aggregator 6

File

jsmin.php

<?php

/**
 * jsmin.php - PHP implementation of Douglas Crockford's JSMin.
 *
 * This is pretty much a direct port of jsmin.c to PHP with just a few
 * PHP-specific performance tweaks. Also, whereas jsmin.c reads from stdin and
 * outputs to stdout, this library accepts a string as input and returns another
 * string as output.
 *
 * PHP 5 or higher is required.
 *
 * Permission is hereby granted to use this version of the library under the
 * same terms as jsmin.c, which has the following license:
 *
 * --
 * Copyright (c) 2002 Douglas Crockford  (www.crockford.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * The Software shall be used for Good, not Evil.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * --
 *
 * @package JSMin
 * @author Ryan Grove <[e-mail]>
 * @copyright 2002 Douglas Crockford <[e-mail]> (jsmin.c)
 * @copyright 2008 Ryan Grove <[e-mail]> (PHP port)
 * @license http://opensource.org/licenses/mit-license.php MIT License
 * @version 1.1.1 (2008-03-02)
 * @link http://code.google.com/p/jsmin-php/
 */
class JSMin {
  const ORD_LF = 10;
  const ORD_SPACE = 32;
  protected $a = '';
  protected $b = '';
  protected $input = '';
  protected $inputIndex = 0;
  protected $inputLength = 0;
  protected $lookAhead = null;
  protected $output = '';

  // -- Public Static Methods --------------------------------------------------
  public static function minify($js) {
    $jsmin = new JSMin($js);
    return $jsmin
      ->min();
  }

  // -- Public Instance Methods ------------------------------------------------
  public function __construct($input) {
    $this->input = str_replace("\r\n", "\n", $input);
    $this->inputLength = strlen($this->input);
  }

  // -- Protected Instance Methods ---------------------------------------------
  protected function action($d) {
    switch ($d) {
      case 1:
        $this->output .= $this->a;
      case 2:
        $this->a = $this->b;
        if ($this->a === "'" || $this->a === '"') {
          for (;;) {
            $this->output .= $this->a;
            $this->a = $this
              ->get();
            if ($this->a === $this->b) {
              break;
            }
            if (ord($this->a) <= self::ORD_LF) {
              throw new JSMinException('Unterminated string literal.');
            }
            if ($this->a === '\\') {
              $this->output .= $this->a;
              $this->a = $this
                ->get();
            }
          }
        }
      case 3:
        $this->b = $this
          ->next();
        if ($this->b === '/' && ($this->a === '(' || $this->a === ',' || $this->a === '=' || $this->a === ':' || $this->a === '[' || $this->a === '!' || $this->a === '&' || $this->a === '|' || $this->a === '?')) {
          $this->output .= $this->a . $this->b;
          for (;;) {
            $this->a = $this
              ->get();
            if ($this->a === '/') {
              break;
            }
            elseif ($this->a === '\\') {
              $this->output .= $this->a;
              $this->a = $this
                ->get();
            }
            elseif (ord($this->a) <= self::ORD_LF) {
              throw new JSMinException('Unterminated regular expression ' . 'literal.');
            }
            $this->output .= $this->a;
          }
          $this->b = $this
            ->next();
        }
    }
  }
  protected function get() {
    $c = $this->lookAhead;
    $this->lookAhead = null;
    if ($c === null) {
      if ($this->inputIndex < $this->inputLength) {
        $c = $this->input[$this->inputIndex];
        $this->inputIndex += 1;
      }
      else {
        $c = null;
      }
    }
    if ($c === "\r") {
      return "\n";
    }
    if ($c === null || $c === "\n" || ord($c) >= self::ORD_SPACE) {
      return $c;
    }
    return ' ';
  }
  protected function isAlphaNum($c) {
    return ord($c) > 126 || $c === '\\' || preg_match('/^[\\w\\$]$/', $c) === 1;
  }
  protected function min() {
    $this->a = "\n";
    $this
      ->action(3);
    while ($this->a !== null) {
      switch ($this->a) {
        case ' ':
          if ($this
            ->isAlphaNum($this->b)) {
            $this
              ->action(1);
          }
          else {
            $this
              ->action(2);
          }
          break;
        case "\n":
          switch ($this->b) {
            case '{':
            case '[':
            case '(':
            case '+':
            case '-':
              $this
                ->action(1);
              break;
            case ' ':
              $this
                ->action(3);
              break;
            default:
              if ($this
                ->isAlphaNum($this->b)) {
                $this
                  ->action(1);
              }
              else {
                $this
                  ->action(2);
              }
          }
          break;
        default:
          switch ($this->b) {
            case ' ':
              if ($this
                ->isAlphaNum($this->a)) {
                $this
                  ->action(1);
                break;
              }
              $this
                ->action(3);
              break;
            case "\n":
              switch ($this->a) {
                case '}':
                case ']':
                case ')':
                case '+':
                case '-':
                case '"':
                case "'":
                  $this
                    ->action(1);
                  break;
                default:
                  if ($this
                    ->isAlphaNum($this->a)) {
                    $this
                      ->action(1);
                  }
                  else {
                    $this
                      ->action(3);
                  }
              }
              break;
            default:
              $this
                ->action(1);
              break;
          }
      }
    }
    return $this->output;
  }
  protected function next() {
    $c = $this
      ->get();
    if ($c === '/') {
      switch ($this
        ->peek()) {
        case '/':
          for (;;) {
            $c = $this
              ->get();
            if (ord($c) <= self::ORD_LF) {
              return $c;
            }
          }
        case '*':
          $this
            ->get();
          for (;;) {
            switch ($this
              ->get()) {
              case '*':
                if ($this
                  ->peek() === '/') {
                  $this
                    ->get();
                  return ' ';
                }
                break;
              case null:
                throw new JSMinException('Unterminated comment.');
            }
          }
        default:
          return $c;
      }
    }
    return $c;
  }
  protected function peek() {
    $this->lookAhead = $this
      ->get();
    return $this->lookAhead;
  }

}

// -- Exceptions ---------------------------------------------------------------
class JSMinException extends Exception {

}

Classes

Name	Description
JSMin	jsmin.php - PHP implementation of Douglas Crockford's JSMin.
JSMinException